CN105034092A - Efficient production method for cold-pressed recombined bamboo timber - Google Patents
Efficient production method for cold-pressed recombined bamboo timber Download PDFInfo
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Abstract
The invention provides an efficient production method for cold-pressed recombined bamboo timber. The efficient production method comprises the following technological steps that 1, bamboo splits are dipped in modified low-temperature curing phenol glue; 2, charging and steam-injection for pre-heating are conducted; 3, die pressing is conducted; 4, slabs are heated and cured in a tunnel kiln. The efficient production method has the beneficial effects that that the manufactured cold-pressed recombined bamboo timber can shorten heating time, and the hot pressing efficiency of the recombined bamboo timber is greatly improved; besides, the density of the recombined bamboo timber is lowered by over 10%, and the internal stress of the recombined bamboo timber is lowered; the release time of the internal stress is shortened or release of the internal stress is not needed; during cold pressing, the pressure is only three fourths of conventional pressure, and wire skipping, cracking and other defects of finished products will be reduced; and the quality of the cold-pressed recombined bamboo timber is improved, and therefore the cold-pressed recombined bamboo timber can better meet market demands.
Description
Technical field
What the present invention relates to is a kind of efficient production method of Recombined bamboo of colding pressing, and belongs to the wood-based plate manufacturing technology field in timber industry.
Background technology
Recombined bamboo (also known as bamboo recombined material, heavy bamboo) is the structure and decoration Novel bamboo wood-based plate that are formed through improving, improving on the basis of bamboo laminated board.The main production process of Recombined bamboo is after bamboo wood is removed bamboo green layer, pass through planing tabasheer again, roll the special thin bamboo strips used for weaving or bamboo bundle sheet that add and be sewn into and have and run through gap, through impregnation, drying, cold moudling-heat cure or hot press hot-forming, producing density is 1.0g/cm
3and above bamboo recombined material.So-called cold moudling-thermal curing method refers to that rolling after by impregnation adds the normal temperature high voltage compression molding in steel die of seam thin bamboo strips used for weaving, then together with mould, in high temperature kiln, (temperature 120 DEG C-135 DEG C) solidification forms, shaping slab sectional dimension majority is 2550mm*140mm*140mm, and the Recombined bamboo that the method is made is usually referred to as Recombined bamboo of colding pressing.The method needs the heat cure through more than more than 10 hour in hyperthermia tunnel Kiln, there is shaping speed fast, small investment, the advantages such as output is large, but there is hypertonia (more than 65MPa) when colding pressing, mould loss is large, internal stress is large, thermal curing time is long, the Stress Release time long (stacking in more than 15 days) after mould unloading, the moisture content of sheet material is uneven, easily occurs jumping the defect such as silk and cracking in use procedure, although market demand is very large, a kind of good mode of production is not also found in the production of the Recombined bamboo of colding pressing of high-quality.For this reason on the basis of the existing production technology of Recombined bamboo of colding pressing, the mode of production is improved to it, improves its production efficiency and quality.
It is different from common hot pressing heat-transfer mechanism that preheating is steamed in spray, common hot pressing is that then steel plate carries out heat transfer heating to slab again by steam or deep fat heating steel sheet, and the slab bulk temperature rate of climb is slow, the time that plate forming solidification needs is long, being heating and curing of suitable slim wood-based plate.It is that spray penetration is inner to slab rapidly by high temperature super heated steam etc. that preheating is steamed in spray, heats whole slab evenly, instantaneously, reaches the new technology of short time solidification.In the moment that steam sprays, high temperature super heated steam can transfer heat to each corner of slab at once with steam, make core layer temperature reach more than 100 DEG C immediately, substantially not by the impact of slab thickness, greatly can shorten hot pressing time.Spray is steamed preheating method and is particularly suitable for compacting that is thick, special heavy plate.
The steam injection pressing cycle is only 1/5 ~ 1/4 of conventional thermocompression, and hot pressing energy consumption is only about 1/10 of conventional thermocompression.As can be seen here, the efficiency of steam injection pressing heat transfer is very high.
In addition, the best curing temperature of conventional phenol glue is at 135 DEG C, the solidification temperature of the low-temperature solidified phenolic of modification is 105 ~ 110 DEG C, adopt this low-temperature solidified phenolic glue as adhesive, the solidification temperature of Recombined bamboo blank in tunnel cave of colding pressing just need not be elevated to 135 DEG C, the isothermal holding expense of tunnel cave can be reduced, also greatly can reduce energy consumption.
Adopt the existing Recombined bamboo production technology of colding pressing of these two kinds of process modification, production efficiency and the quality of Recombined bamboo of colding pressing will be improved, as when meeting floor etc. and requiring, the density (reducing by more than 10%) of sheet material can be reduced, reduce the internal stress of Recombined bamboo, shorten (or need not) the internal stresses release time, the heat transfer time in tunnel cave shortens greatly, only has the 40-50% of conventional making sheet.Pressure when colding pressing only needs 3/4 of conventional making sheet pressure, and the defect such as jumping silk, cracking of finished product will be improved greatly.
Summary of the invention
What the present invention proposed is a kind of efficient production method of Recombined bamboo of colding pressing, its object is intended to utilize spray to steam preheating, when slab being compressed to certain density, utilizing the diffusion of high temperature and high pressure steam to improve rapidly the temperature of slab inside, then in hyperthermia tunnel Kiln, continuing heating; Simultaneously in conjunction with the phenol glue of modification, its solidification temperature is reduced, so common hardening time shortening Recombined bamboo of colding pressing, improve hot pressing efficiency, reduce pressure during hot pressing, the defects such as the jumping silk that the conventional Recombined bamboo of colding pressing of minimizing simultaneously has, cracking, internal stress are large.
Technical solution of the present invention: a kind of efficient production method of Recombined bamboo of colding pressing, comprises following processing step:
A, dipping process, after thin bamboo strips used for weaving drying, adopt modification low-temperature solidified phenolic glue dipping, then low temperature 60 ~ 80 DEG C of dryings;
Preheating is steamed in b, charging and spray, and quantitatively mated formation by the thin bamboo strips used for weaving justify align after impregnation drying in charging hopper, add top board, the height of the slab now do not compressed is 3 times high of final sheet metal thickness, is about 0.45 ~ 0.65g/cm by overwhelming density under it
3time, start to carry out spray from slab both sides or bottom surface and steam preheating, the pressure of steam is 0.4MPa ~ 0.8MPa, and steam injection time is 30 ~ 60 seconds, regulates according to the temperature of steam and the width of slab;
C, mold pressing, slab is compressed to the final thickness of needs by spray immediately after steaming and terminating, on pressing plate, throw stop screw into and fixed by other end fastening nut, this charging hopper, mould, pressing plate all need heating source, guarantee that its temperature is remaining on 95 ~ 100 DEG C;
D, slab continue to be heating and curing, and advanced rapidly in hyperthermia tunnel Kiln by the slab that preheating is steamed in spray, in kiln, continue heating together with mould, and slab top layer and intermediate layer continue to absorb heat, and adhesive rapid solidification, just can obtain the bamboo Recombined bamboo of colding pressing of improvement.
Advantage of the present invention: bamboo plant is the xylophyta that on the earth, the speed of growth is the fastest, breeding is the easiest, the maturity period is the shortest, it is the environment-friendly material of the mankind, it has once afforests successfully, just can cut selectively, continuous utilization and do not destroy the feature of ecological environment every year.The whole nation existing bamboo grove area 6,730,000 hectares, is mainly distributed in 16 provinces in the whole nation, for the production of bamboo Recombined bamboo of colding pressing provides continuable raw material resources.Bamboo Recombined bamboo of colding pressing also can make a utilization rate of the large footpath such as mao bamboon bamboo woods be increased to more than 80% from 20% ~ 50%, makes dwarf bamboo and Cluster Bamboo etc. fail the utilization rate of bamboo of industrialized utilization and also can reach more than 80%.Produce the bamboo Recombined bamboo of colding pressing of large gauge by the mode of spray steaming preheating, hot pressing pressure can be reduced, reduce internal stress in slab, improve its quality and shorten the heat time.The production of the continuous bamboo Recombined bamboo of large gauge is made to become possibility, also for the sound development of bamboo Recombined bamboo of colding pressing provides safeguard.
Detailed description of the invention
To cold pressing the efficient production method of Recombined bamboo, comprise following processing step: a) thin bamboo strips used for weaving adopts modification low-temperature solidified phenolic glue dipping; B) preheating is steamed in charging and spray; C) mold pressing; D) slab is at tunnel cave internal heating curing.
Described step a) thin bamboo strips used for weaving adopts modification low-temperature solidified phenolic glue dipping, after thin bamboo strips used for weaving drying, adopts modification low-temperature solidified phenolic glue dipping, then low temperature 60 ~ 80 DEG C of dryings.
Preheating is steamed in the charging of described step b) and spray, is quantitatively mated formation by the thin bamboo strips used for weaving justify align after impregnation drying in charging hopper and in mould, slab is put a block pressur plate, is 0.45 ~ 0.65g/cm by it to pressing to density
3time, the numerous apertures started from the hopper and mould of slab both sides carry out spray and steam preheating, and the pressure of steam is 0.4MPa ~ 0.8MPa, steam injection time is 30 ~ 60 seconds, regulate according to the temperature of steam and the width of slab, during vapor (steam) temperature height, steam injection time suitably shortens; When width of plate slab increases, steam injection time increases.
Described step c) mold pressing, slab is compressed to the final thickness 140mm of needs by spray immediately after steaming and terminating, on pressing plate, throw stop screw into and its one end fastening nut is fixed, the other end is the cap head of screw, this charging hopper, mould, pressing plate all need heating source, guarantee that its temperature is remaining on 95 ~ 100 DEG C.
Described step d) slab continues to be heating and curing, preheated slab is steamed in spray advance rapidly in hyperthermia tunnel Kiln together with mould, in kiln, continue heating 2 ~ 5 hours, make slab top layer and intermediate layer continue to absorb heat, adhesive rapid solidification, just can obtain the Recombined bamboo of colding pressing of improvement.
Can also be carry out spray to the recombinant material of colding pressing of other fiber-like material to steam preheating, the material of this recombinant material can be Wooden veneer bar, straw unit material.
Claims (6)
1. to cold pressing the efficient production method of Recombined bamboo, it is characterized in that the method comprises following processing step: a) thin bamboo strips used for weaving adopts modification low-temperature solidified phenolic glue dipping; B) preheating is steamed in charging and spray; C) mold pressing; D) slab is at tunnel cave internal heating curing.
2. the efficient production method of Recombined bamboo of colding pressing according to claim 1, it is characterized in that described step a) thin bamboo strips used for weaving adopts modification low-temperature solidified phenolic glue dipping, after thin bamboo strips used for weaving drying, adopt modification low-temperature solidified phenolic glue dipping, then low temperature 60 ~ 80 DEG C of dryings.
3. the efficient production method of Recombined bamboo of colding pressing according to claim 1, it is characterized in that preheating is steamed in described step b) charging and spray, thin bamboo strips used for weaving justify align after impregnation drying is quantitatively mated formation in charging hopper and in mould, slab being put a block pressur plate, is 0.45 ~ 0.65g/cm by it to pressing to density
3time, the numerous apertures started from the hopper and mould of slab both sides carry out spray and steam preheating, and the pressure of steam is 0.4MPa ~ 0.8MPa, steam injection time is 30 ~ 60 seconds, regulate according to the temperature of steam and the width of slab, vapor (steam) temperature is high, and steam injection time suitably shortens; When width of plate slab increases, increase steam injection time.
4. the efficient production method of Recombined bamboo of colding pressing according to claim 1, it is characterized in that described step c) mold pressing, slab is compressed to needs by spray immediately final thickness 140mm after steaming and terminating is thick, on slab pressing plate, throw stop screw into and its one end fastening nut is fixed, this charging hopper, mould, pressing plate all need heating source, guarantee that its temperature remains on 95 ~ 100 DEG C.
5. the efficient production method of Recombined bamboo of colding pressing according to claim 1, it is characterized in that described step d) slab continues to be heating and curing, preheated slab is steamed in spray advance rapidly in hyperthermia tunnel Kiln together with mould, heating is continued 2 ~ 5 hours in kiln, slab top layer and intermediate layer is made to continue to absorb heat, adhesive rapid solidification, just can obtain the Recombined bamboo of colding pressing of improvement.
6. the efficient production method of Recombined bamboo of colding pressing according to claim 1, its feature can also be carry out spray to the recombinant material of colding pressing of other fiber-like material to steam preheating, as Wooden veneer bar, straw unit material.
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| CN106363725A (en) * | 2016-09-06 | 2017-02-01 | 南京林业大学 | Manufacture method of cold compression recombination bamboo with random length |
| CN106738184A (en) * | 2017-01-06 | 2017-05-31 | 福建省永安林业（集团）股份有限公司永安人造板厂 | Production method and process units without aldehyde type medium density fibre board (MDF) |
| CN106926325A (en) * | 2017-03-03 | 2017-07-07 | 西南林业大学 | A kind of apparatus and method of the pre- thermal acceleration thermosetting resin solidification of steam penetration |
| CN107498656A (en) * | 2017-07-25 | 2017-12-22 | 南京林业大学 | A kind of high-efficiency method for producing of small dimension wood composite wood |
| CN108145826A (en) * | 2018-01-30 | 2018-06-12 | 江西鼎宏生物科技有限公司 | Utilize the method for bamboo making iron Dan Mu |
| CN112493894A (en) * | 2020-11-29 | 2021-03-16 | 湖南省新化县伟星竹木制品有限公司 | Deformation-resistant and cracking-resistant bamboo-wood composite chopping board and preparation method thereof |
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| CN106363725A (en) * | 2016-09-06 | 2017-02-01 | 南京林业大学 | Manufacture method of cold compression recombination bamboo with random length |
| CN106738184A (en) * | 2017-01-06 | 2017-05-31 | 福建省永安林业（集团）股份有限公司永安人造板厂 | Production method and process units without aldehyde type medium density fibre board (MDF) |
| CN106738184B (en) * | 2017-01-06 | 2022-06-21 | 福建省永安林业（集团）股份有限公司永安人造板厂 | Production method and production device of aldehyde-free medium-density fiberboard |
| CN106926325A (en) * | 2017-03-03 | 2017-07-07 | 西南林业大学 | A kind of apparatus and method of the pre- thermal acceleration thermosetting resin solidification of steam penetration |
| CN107498656A (en) * | 2017-07-25 | 2017-12-22 | 南京林业大学 | A kind of high-efficiency method for producing of small dimension wood composite wood |
| CN107498656B (en) * | 2017-07-25 | 2021-06-25 | 南京林业大学 | Efficient production method of small-diameter wood composite material |
| CN108145826A (en) * | 2018-01-30 | 2018-06-12 | 江西鼎宏生物科技有限公司 | Utilize the method for bamboo making iron Dan Mu |
| CN112493894A (en) * | 2020-11-29 | 2021-03-16 | 湖南省新化县伟星竹木制品有限公司 | Deformation-resistant and cracking-resistant bamboo-wood composite chopping board and preparation method thereof |
| CN112493894B (en) * | 2020-11-29 | 2022-09-30 | 湖南省新化县伟星竹木制品有限公司 | Deformation-resistant and cracking-resistant bamboo-wood composite chopping board and preparation method thereof |
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Application publication date: 20151111 Assignee: Fujian Province bamboo science and Technology Co., Ltd. Assignor: Nanjing Forestry University Contract record no.: 2018320000411 Denomination of invention: Efficient production method for cold-pressed recombined bamboo timber Granted publication date: 20171010 License type: Common License Record date: 20181219 |
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Application publication date: 20151111 Assignee: Yongan Yalin Bamboo Research Institute Co., Ltd. Assignor: Nanjing Forestry University Contract record no.: 2018320000436 Denomination of invention: Efficient production method for cold-pressed recombined bamboo timber Granted publication date: 20171010 License type: Common License Record date: 20181225 |